refactor: remove unused authentication files and dependencies; update package.json to streamline dependencies and improve project structure

packages/backend/convex/schema.ts

@@ -1,7 +1,5 @@
 import { defineSchema, defineTable } from "convex/server";
 import { Infer, v } from "convex/values";
-import { tables } from "./betterAuth/schema";
-import { cidrv4 } from "better-auth";
 
 export const simboloTipo = v.union(
   v.literal("cargo_comissionado"),
@@ -245,6 +243,7 @@ export default defineSchema({
     acao: v.string(), // "criar", "ler", "editar", "excluir"
   })
     .index("by_recurso", ["recurso"])
+    .index("by_recurso_e_acao", ["recurso", "acao"])
     .index("by_nome", ["nome"]),
 
   rolePermissoes: defineTable({